I know it's a bit late now, but about the subject of the Toto C2...
As far as a bidet seat goes, I recommend the Vovo 3100 over the Toto C2 ( I guess Koreans like their bidets too).
The Vovo has a heater rated for 1100W, as opposed to the Toto's 500W heater. Haven't had hot water run out yet...